/ Dictionary / Index O Osteichthyes: Meaning and Definition of Find definitions for: Os•te•ich•thy•es Pronunciation: (os"tē-ik'thē-ēz"), [key] — n. the class comprising the bony fishes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: osteichthyes (Thesaurus) ostectomy osteitis Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language